fromJson static method

Cell? fromJson(dynamic value)

Returns a new Cell instance and imports its values from value if it's a Map, null otherwise.

Implementation

// ignore: prefer_constructors_over_static_methods
static Cell? fromJson(dynamic value) {
  if (value is Map) {
    final json = value.cast<String, dynamic>();

    // Ensure that the map contains the required keys.
    // Note 1: the values aren't checked for validity beyond being non-null.
    // Note 2: this code is stripped in release mode!
    assert(() {
      assert(json.containsKey(r'row'), 'Required key "Cell[row]" is missing from JSON.');
      assert(json[r'row'] != null, 'Required key "Cell[row]" has a null value in JSON.');
      assert(json.containsKey(r'column'), 'Required key "Cell[column]" is missing from JSON.');
      assert(json[r'column'] != null, 'Required key "Cell[column]" has a null value in JSON.');
      assert(json.containsKey(r'value'), 'Required key "Cell[value]" is missing from JSON.');
      return true;
    }());

    return Cell(
      row: mapValueOfType<int>(json, r'row')!,
      column: mapValueOfType<String>(json, r'column')!,
      value: mapValueOfType<Object>(json, r'value'),
    );
  }
  return null;
}